Ronksley Paul, Scory Tayler, Weaver Robert, Lunney Meaghan, Rodin Rachel, Tonelli Marcello
Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, AB.
Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary, AB.
Can Commun Dis Rep. 2021 Nov 10;47(11):473-475. doi: 10.14745/ccdr.v47i11a05.
Governments worldwide are looking for ways to safely enable international travel while mitigating the spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), and the associated coronavirus disease 2019 (COVID-19). However, few data describe the impact of vaccination on importation of COVID-19. We took advantage of the sequential introduction of two government policies in Canada to evaluate the real-world evidence of vaccine effectiveness among 30,361 international travellers arriving by air in Alberta, Canada. The proportion of COVID-19-positive results for travellers who were either fully vaccinated or partially vaccinated was 0.02% (95% CI: 0.00-0.10) (i.e. one positive case among 5,817 travellers). In contrast, 1.42% (95% CI: 1.27-1.58) of unvaccinated travellers tested positive for SARS-CoV-2 (341 cases among 24,034 travellers). These findings suggest that COVID-19 vaccinations approved in Canada, substantially reduced the risk of travel-related importation of COVID-19 when combined with other public health measures. The low absolute rate of infection among fully vaccinated or partially vaccinated international travellers may inform quarantine requirements in this population.
世界各国政府都在寻找既能安全地促进国际旅行，又能减轻严重急性呼吸综合征冠状病毒2（SARS-CoV-2）传播以及相关的2019冠状病毒病（COVID-19）的方法。然而，很少有数据描述疫苗接种对COVID-19输入的影响。我们利用加拿大两项政府政策的相继出台，评估了30361名乘飞机抵达加拿大艾伯塔省的国际旅行者中疫苗有效性的真实证据。完全接种或部分接种疫苗的旅行者中COVID-19检测呈阳性的比例为0.02%（95%置信区间：0.00-0.10）（即5817名旅行者中有1例阳性）。相比之下，未接种疫苗的旅行者中1.42%（95%置信区间：1.27-1.58）的SARS-CoV-2检测呈阳性（24034名旅行者中有341例）。这些发现表明，在加拿大获批的COVID-19疫苗与其他公共卫生措施相结合时，大幅降低了与旅行相关的COVID-19输入风险。完全接种或部分接种疫苗国际旅行者中感染的绝对率较低，这可能为该人群的检疫要求提供参考。
